import math

(x1, y1, x2, y2) = [float(i) for i in input().split()]

distance = math.hypot((x2 - x1), (y2 - y1))
print('{0:.5f}'.format(distance)) import math math float(i) for i in input().split() for i in input().split() i input().split() ().split () input split for i in input().split() float(i) float i (x1, y1, x2, y2) = [float(i) for i in input().split()] (x1, y1, x2, y2) x1 y1 x2 y2 [float(i) for i in input().split()] distance = math.hypot((x2 - x1), (y2 - y1)) distance math.hypot((x2 - x1), (y2 - y1)) math.hypot math hypot x2 - x1 x2 x1 y2 - y1 y2 y1 print('{0:.5f}'.format(distance)) print '{0:.5f}'.format(distance) '{0:.5f}'.format '{0:.5f}' format distance distance = math.hypot((x2 - x1), (y2 - y1)) math.hypot((x2 - x1), (y2 - y1)) distance
import math

(x1, y1, x2, y2) = [float(i) for i in input().split()]

distance = math.hypot((x2 - x1), (y2 - y1))
print('{0:.5f}'.format(distance))